Piston-ring



H. T. ANDREW.

PISTON RING. APPLICATION FILED AUG. 12, 1919.

Patented Oct. 19, 1920.

WITNESSES C C v nvmvrim h. I Y AND E;

A HOB/V578 PATENT. OFFICE.

HARVE '1. ANDREW, OF MARION, IOWA.

PISTON-RING.

Specification of Letters Patent.

Application filed August 12, 1919. Serial No. 317,059.

To all whom it may concern:

Be it known that I, HARVE T. ANDREW, a

citizen of the United States, and a resident.-

the following is a specification.

Y My invention is an improvement in piston rings, and has for its object to provide a ring of the character specified, which is easily placed or removed, consisting of sections, each of which is a split ring, but so held with respect to each other that pressure cannot pass the ring by Way of the splits in the sections.

In the drawings:

Figure 1 is a top plan View of one of the rings, i

Fig. 2 is a section of a portion of the cylinder provided with the rings,

Fig. 3 is a diametrical section of a rin Fig. 4: is a perspective view of one 0 the sections.

In the present embodiment of the invention the improved ring is composed of similar sections. Each section I is a split ring and each section has at its center, that is at a point directly opposite the split an are shaped extension 2, curved on the same are as the ring. The sections are adapted to rest upon each other in superposed relation, and

the ends of each section are rabbeted as shown at 3 to receive the extension 2 of the other section.

These extensions have a width corresponding to the width of the section, and the rabbets are of such depth that the extensions will fit within the rabbets with the inner faces of the extensions flush with the inner faces of the ring. The aggregate arc of the rabbets is slightly greater than that of the extension, so that the sections may move freely angularl within limits with respect to each other. The extensions are at the innor faces of the sections, and are of a thickness corresponding approximately to half the thickness of the section, so that when the sections are fitted together the outer faces of the sections will be flush. The improved ring is shown in Fig. 2 within the annular groove 4 of a piston 5. It will be evident from the description that while the improved ring may conform to the piston, to fit tightly within the groove, it will not permit the escape of pressure from the cylinder by the splits of the section, since each split is closed by the lapping of the other section. This applies to movement of the pressure longitudinally of the cylinder, as well as to movement radially of the cylinder. Since each section of each ring is similar to the other section, the rings may be easily and cheaply manufactured, but a single form, pattern or mold being required for the sections.

Referring to Figs. 1 and 4- it will be noticed that each section has its ends beveled in such manner that they overlap when the said ends are abutted against each other.

,I claim:

A concentric piston ring comprising similar sections arranged in superposed position, each section being split and the sections being disposed With the split of one diametrically opposite the split of the other, each section having its inner periphery rabbeted at the sides of the split to define a recess having abrupt shoulder, and each section being formed at one edge opposite the split, with an extension having radial shoulders and. of the same Width as the recess and adapted to fit within the recess of the other section, the extension being of" the same height as the Width of the section. i

HARVE T. ANDREW.

Patented Oct. 19,1920. 

